. The cell in development and inheritance. Cells. PRELIMINARY GENERAL SKETCH 183. E F Fig. 90. —Fertilization of the egg of Ascaris megalocephala, var. bivalens. [BovERl.] (For later stages see Figs. 31, 145.) A. The spermatozoon has entered the egg, its nucleus is shown at S ; beside it lies the granu- lar mass of " archoplasm " (attraction-sphere) ; above are the closing phases in the formation of the second polar body (two chromosomes in each nucleus). B. Germ-nuclei (?, d") in the reticular stage; the attraction-sphere (a) contains the dividing centrosome. C. Chromosomes for
. The cell in development and inheritance. Cells. PRELIMINARY GENERAL SKETCH 183. E F Fig. 90. —Fertilization of the egg of Ascaris megalocephala, var. bivalens. [BovERl.] (For later stages see Figs. 31, 145.) A. The spermatozoon has entered the egg, its nucleus is shown at S ; beside it lies the granu- lar mass of " archoplasm " (attraction-sphere) ; above are the closing phases in the formation of the second polar body (two chromosomes in each nucleus). B. Germ-nuclei (?, d") in the reticular stage; the attraction-sphere (a) contains the dividing centrosome. C. Chromosomes forming in the germ-nuclei; the centrosome divided. D. Each germ-nucleus resolved into two chromosomes; attraction-sphere [a) double. E. Mitotic figure forming for the first cleavage; the chromosomes {c) already split. F. First cleavage in progress, showing divergence of the daughter-chromosomes toward the spindle-poles (only three chromosomes shown).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York Macmillan
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1906
